21. The hood had been cleaned that day but the grease trap had not been put back on it. 22. Restaurants must not pay for grease trap pumping as do restaurants with conventional grease traps or grease interceptors. 23. The rotting brown grease inside a grease trap or grease interceptor must be pumped out on a scheduled basis. 24. There are definitely some places around town where they are having problems with people not cleaning out their grease traps , 25. This 80-year-old restaurant is in a 100-year-old building whose grease trap lies above a storied downtown tunnel called Jacob's Run. 26. The most common passive grease traps are smaller, point-of-use units used under three-compartment sinks or adjacent to dishwashers in the kitchen. 27. According to Joe Sullins, supervisor for the city's building inspection service, all new restaurants are required to have grease traps installed. 28. A grease trap is a container connected to a drain that is designed to catch grease before it goes into the sewer. 29. The waste goes through a grease trap , then to two sequencing batch reactors or SBRs that convert and stabilize its organic compounds. 30. Grease traps have been used since Victorian days . Nathaniel Whiting obtained the first patent for a grease trap in the late 1800s.